Maro's power and toughness are each equal to the number of cards in your hand.

Flying

Pay 4 life: Regenerate Marrow Bats.

( can be paid with either or 2 life.)

Marrow Shards deals 1 damage to each attacking creature.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

When Marsh Crocodile enters the battlefield, return a blue or black creature you control to its owner's hand.

When Marsh Crocodile enters the battlefield, each player discards a card.

Flying

When Marsh Flitter enters the battlefield, create two 1/1 black Goblin Rogue creature tokens.

Sacrifice a Goblin: Marsh Flitter has base power and toughness 3/3 until end of turn.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Sacrifice a Swamp: Marsh Lurker gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

Whenever Marsh Viper deals damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)

Creatures you control get +1/+1 and gain vigilance until end of turn.

Cycling (, Discard this card: Draw a card.)

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Multikicker (You may pay an additional any number of times as you cast this spell.)

Creatures you control get +1/+1.

When Marshal's Anthem enters the battlefield, return up to X target creature cards from your graveyard to the battlefield, where X is the number of times Marshal's Anthem was kicked.

Flying

, : Rather than pay the mana cost of the next spell you cast this turn, you may pay life equal to that spell's mana value.

Woman Who Walked the Earth — When Martha Jones enters the battlefield, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Whenever you sacrifice a Clue, Martha Jones and up to one other target creature can't be blocked this turn.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Target creature gets +3/+0 until end of turn.

Target creature gets +0/+3 until end of turn.

At the beginning of your upkeep, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

When Martyr for the Cause dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

, Reveal X black cards from your hand, Sacrifice Martyr of Bones: Exile up to X target cards from a single graveyard.

, Reveal X blue cards from your hand, Sacrifice Martyr of Frost: Counter target spell unless its controller pays .

, Reveal X green cards from your hand, Sacrifice Martyr of Spores: Target creature gets +X/+X until end of turn.

, Sacrifice a creature: Target creature can't attack this turn.

Sacrifice a creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.

As long as Martyrs of Korlis is untapped, all damage that would be dealt to you by artifacts is dealt to Martyrs of Korlis instead.

Pay 2 life: Prevent the next 1 damage that would be dealt to target creature this turn.

Whenever Marvo, Deep Operative attacks, clash with defending player. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)

Whenever you win a clash, draw a card. Then you may cast a spell from your hand with mana value 8 or less without paying its mana cost.

: Switch a Killbot or Mary O'Kill in your hand with one on the battlefield. (If a creature is tapped, the switched creature is tapped. The same is true for untapped, attacking, blocking, enchanted, equipped, and targeted. Any counters on a creature are on the switched creature instead.)

This spell costs less to cast if it targets a creature token.

Gain control of target creature until end of turn. Untap that creature. It gets +2/+0 and gains haste until end of turn.

At the beginning of each player's upkeep, if there are four or more basic land types among lands that player controls, Mask of Intolerance deals 3 damage to that player.

Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

, , Sacrifice Mask of the Jadecrafter: Create an X/X colorless Golem artifact creature token. Activate only as a sorcery.

Unearth (: Return this card from your graveyard to the battlefield. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

When Masked Admirers enters the battlefield, draw a card.

Whenever you cast a creature spell, you may pay . If you do, return Masked Admirers from your graveyard to your hand.

Green creatures and white creatures have protection from Gorgons.

Threshold — Masked Gorgon has protection from green and from white as long as seven or more cards are in your graveyard.

Exile all creatures you control, then reveal cards from the top of your library until you reveal that many creature cards. Put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library.

If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost.

All creatures get -2/-2 until end of turn.

Menace

Creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)

Whenever a creature an opponent controls dies, if its toughness was less than 1, draw a card.

When Massacre Wurm enters the battlefield, creatures your opponents control get -2/-2 until end of turn.

Whenever a creature an opponent controls dies, that player loses 2 life.

Tap an untapped Cleric you control: Prevent the next 2 damage that would be dealt to any target this turn.

Commander creatures you own have "This creature enters the battlefield with an additional +1/+1 counter on it" and "Other creatures you control enter the battlefield with an additional +1/+1 counter on them."

: Prevent the next 4 damage that would be dealt to any target this turn.

At the beginning of your upkeep, each opponent chooses money, friends, or secrets. For each player who chose money, you and that player each create a Treasure token. For each player who chose friends, you and that player each create a 1/1 green and white Citizen creature token. For each player who chose secrets, you and that player each draw a card.

, Sacrifice another creature: Add . Spend this mana only to cast Vampire, Cleric, and/or Demon spells.

Whenever Master of Diversion attacks, tap target creature defending player controls.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

When Master of Pearls is turned face up, creatures you control get +2/+2 until end of turn.

Flying

At the beginning of your upkeep, each opponent draws a card.

Other Merfolk creatures you control get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

At the beginning of your upkeep, create a 2/2 green Wolf creature token.

: Tap all untapped Wolf creatures you control. Each Wolf tapped this way deals damage equal to its power to target creature. That creature deals damage equal to its power divided as its controller chooses among any number of those Wolves.

Flying

When Master of Winds enters the battlefield, draw two cards, then discard a card.

Whenever you cast an instant, sorcery, or Wizard spell, you may have Master of Winds's base power and toughness become 4/1 or 1/4 until end of turn.

When Master Splicer enters the battlefield, create a 3/3 colorless Phyrexian Golem artifact creature token.

Golems you control get +1/+1.

Draw a card. Master the Way deals damage to any target equal to the number of cards in your hand.

, , Return an artifact you control to its owner's hand: You may put an artifact card from your hand onto the battlefield.

Cast this spell only before attackers are declared.

You choose which creatures attack this turn.

You choose which creatures block this turn and how those creatures block.